One vertex per element, one color per generator, with an edge from x to x·s.
(2,3)(4,8)(11,17)(15,18)(19,23)(22,24)(26,30)(27,33)(32,35)(34,39) involution — undirected(2,3)(4,8)(9,10)(11,15)(12,20)(13,14)(16,21)(17,18)(19,24)(22,23)(25,26,29,30)(27,31,33,37)(28,35,36,32)(34,40,39,38)(1,2,5,3)(4,6,8,7)(10,14)(15,18)(16,20)(22,24)(25,26)(27,31)(28,32)(29,30)(33,37)(34,38)(35,36)(39,40)(2,3)(6,7)(9,10)(11,18)(12,16)(13,14)(15,17)(19,24)(20,21)(22,23)(25,27)(26,31)(28,34)(29,33)(30,37)(32,38)(35,40)(36,39) involution — undirected(1,3,5,2)(4,7,8,6)(9,11)(10,15)(12,19)(13,17)(14,18)(16,22)(20,24)(21,23)(25,28,29,36)(26,32,30,35)(27,34,33,39)(31,38,37,40)(1,4,5,8)(2,6,3,7)(9,12,13,21)(10,16,14,20)(11,19,17,23)(15,22,18,24)(25,27)(26,31)(28,34)(29,33)(30,37)(32,38)(35,40)(36,39)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.